Sunlight Resistant SO Cord [RE-wrenches]

[Allan Sindelar]

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Here is John Wiles' excellent response:

> Allan:
>
> On flexible cords and cables:
>
> Section 690.31(C) of the NEC allows, but does not require, the use of
> Article 400 flexible power cords on trackers.  Although they are
> available with the appropriate ratings, here in the sunny Southwest,
> we find that the insulation gets stiff after a few years in the sun.
> The modest rotational rate of trackers (900 revolutions per decade)
> usually means that exposed USE-2 single conductors cables with some
> room to move work fine on trackers as do RHW-2 conductors in flexible
> nonmetallic conduit.
>
> The NEC identifies the hard-usage flexible cords in Table 400.4.  The
> UL Marking Guide for Wire and Cable (October 2003)
>
(http://underlab2-1.cva-colo.bbnplanet.com:8765/query.html?col=ulcom&qt=mark
ing+Guide)
> indicates that flexible cables that have been evaluated for outdoor
> use will have a "W" in the type designation such as "SJTW" and may
> also be marked "Outdoor".  These cables are suitable for direct
> exposure to outdoor conditions (wet and sunlight").
>
> The Marking Guide contains much other useful information including
> the fact that RHW and RHW-2 cables may be evaluated for exposure to
> sunlight and marked "Sunlight Resistant".   The UL web site
> (www.ul.com) also maintains the current listing status of all
> products, if you can wade through the voluminous material on the site.
> >----- Original Message -----
> >From: "Jeff Clearwater" <clrwater at earthlink.net>
> >
> >690.31 (C) states that all flexible cords for solar trackers must
> >meet Article 400 and table 400.4 and be rated for extra-hard use,
> >weather and water resistant AND be sunlight resistant.
> >
> >But in referring to Table 400.4 I see no reference to Sunlight
> >Resistance nor do I see it in referring to the standard letter
> >designations in Table 310.13 - except that UF cord is listed as
> >sunlight resistant in Article 340 and USE in Article 338.
> >
> >(And where in the code is RHW-2 (multicontact cord) listed as
> >sunlight resistant?)
> >
> >BUT MY MAIN QUESTION IS :Does anyone know which SO cord type is
> >listed as sunlight resistant and/or where in the Code specific
> >reference is made to suitable sunlight resistant flexible cord that
> >will meet 690.31 (C)?
> >
> >Is Sunlight Resistance covered in any standard letter designations or
> >is just an add on rating printed on the Cord.  If that's the case
> >where does one find Sunlight Rated SO Cord?

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